Wow! quite a few comments.
Let me add some of my own.
1. Do not buy a cheap psu.
A cheap PSU will be made of substandard components. It will not have safety and overload protections.
If it fails under load, it can destroy anything it is connected to.
It will deliver advertised power only at room temperatures, not at higher temperatures found when installed in a case.
The wattage will be delivered on the 3 and 5v rails, not on the 12v rails where modern parts
like the CPU and Graphics cards need it. What power is delivered may fluctuate and cause instability
issues that are hard to diagnose.
The fan will need to spin up higher to cool it, making it noisy.
A cheap PSU can become very expensive. Do not buy one.
The cheap corsair units may not be that reliable, but They are not dangerous if they fail.
Corsair is good about replacing them under warranty.
I have had two of the CX430 units fail which were replaced promptly.
In other countries, Seasonic seems to not be as expensive as in the USA. They are universally good.
If you will have this build for a long time and anticipate a graphics upgrade, buy more than the minimum 380w that a GTX950 needs.
Usually, 550w is not that much more expensive.
Here is a handy chart for wattage required vs. graphics card:
http://www.realhardtechx.com/index_archivos/Page362.htm
2. Ram decisions.
Consider carefully what your future ram requirements will be.
8gb is sufficient for gaming.
But, if you will start multitasking then you may need more.
Do not think that buying a single 8gb stick now will let you add another in the future.
Ram is supported only in matched kits.
Adding ram later may or may not work. Intel is more tolerant of mismatched ram than ryzen.
ryzen is particularly sensitive to ram and not all ddr4 ram will work. One needs to look at the QVL ram support list for a motherboard/cpu combination to be certain of proper functioning. Or, the ram vendor needs to explicitly support the ram.
It pays to check the specifics before you buy.
If you have a severe budget, buy a 2 x 4gb kit now, and plan on replacing it with a 2 x 8gb kit in the future if you need more.
Sell the old kit or keep it as a spare.
3. which cpu?
If your use is for multithreaded batch apps, ryzen is hard to beat.
If your use is for gaming, particularly sims, strategy and mmo games, then the clock rate is all important.
Also, the performance per clock of ryzen has vastly improved, but it is not yet quite as good as intel. Perhaps85%
To compare different cpu characteristics, passmark ratings are a reasonable way to compare.
4. Which gpu?
A reasonable way to rank graphics cards is to use tom's gpu hierarchy list:
https://www.tomshardware.com/reviews/gpu-hierarchy,4388.html
A difference of a couple of tiers is not that important.
5. Used?
If you are on a severe budget, consider used.
A complete used pc is often sold at less than the value of the individual parts.
Don't forget to include the cost of windows in your plans.
------------------ good luck-----------------
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